Multi-annual comparisons of summer and under-ice phytoplankton communities of a mountain lake

Obertegger, Ulrike; Flaim, Giovanna; Corradini, Stefano; Cerasino, Leonardo; Zohary, Tamar

doi:10.1007/s10750-022-04952-3

Cited by 6 publications

(1 citation statement)

References 78 publications

(107 reference statements)

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“…Early spring clusters have high connections to winter clusters and are dominated by mixotrophic Dinophyceae, while late spring clusters (02TA) show more similarities to summer clusters (Stoecker et al, 2017). The "late" spring cluster (08TS) reflects a bloom of primary producers with Ochrophyta (especially Bacillariophyta species), the dominant family (Obertegger et al, 2022). It is remarkable that Dinophyceae are present in almost all seasons, with the exception of the low light period, which is predominantly occupied by heterotrophic Syndiniales.…”

Section: Discussionmentioning

confidence: 99%

Beyond blooms: A novel time series analysis framework predicts seasonal keystone species and sheds light on Arctic pelagic ecosystem stability

Oldenburg,

Kronberg,

Metfies

et al. 2024

Preprint

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A thorough understanding of ecosystem functioning in the Arctic Ocean, a region under severe threat by climate change, requires detailed studies on inhabiting biological communities. The identification of keystone species with special ecological relevance is of great importance, yet difficult to achieve with established community assessments. In the case of microbes, metabarcoding and metagenomics offer fundamental insights into community structure and function, yet remain limited regarding conclusions about the role of individual species within the ecosystem. To overcome this limitation, we have developed an analytical approach based on three different methods: Co-Occurrence Networks, Convergent Cross Mapping, and Energy Landscape Analysis. These methods enable the identification of seasonal communities in microbial ecosystems, elucidate their interactions, and predict potential stable community configurations under varying environmental conditions. Combining the outcomes of these three methods allowed us to define 19 keystone species that are representative for the different trophic modes that build the local food web. They may serve as indicator species for monitoring the consequences of environmental change in Arctic marine ecosystems. Our research reveals a clear seasonal pattern in the composition of the microbial phytoplankton community, with distinct assemblages characterizing the carbon fixation (light) and consumption (dark) phases. Species interactions exhibit strong seasonality, and we observed summer communities with significant influence on winter communities but not vice versa. During spring thaw, two distinct groups are present: consumers (heterotrophs), strongly linked to the dark phase, and photoautotrophs (mainly Bacillariophyta), initiating growth (photoautotrophic Bacillariophyta). These groups are not causally related, suggesting a "winter reset" with selective effects that facilitates a new blooming period, allowing survivors of the dark phase to emerge. Investigating the fragility of these ecological systems using Energy Landscape Analysis we demonstrate that winter communities are more stable than summer communities. In summary, the ecological landscape of the Fram Strait can be categorized by two distinct phases: a production phase governed by specialized organisms that are highly responsive to environmental changes, and a consumption phase dominated by generalist species with enhanced resilience.

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Section: Discussionmentioning

confidence: 99%

Beyond blooms: A novel time series analysis framework predicts seasonal keystone species and sheds light on Arctic pelagic ecosystem stability

Oldenburg,

Kronberg,

Metfies

et al. 2024

Preprint

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Spring and autumn rotifer community structure differentiates shallow water bodies in two European ecoregions: Poland and Croatia

Kuczyńska-Kippen,

Špoljar,

Pronin

et al. 2024

Hydrobiologia

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Rotifer structure may serve as predictor of environmental features, including temperate subclimates between water bodies. The difference in latitude between two temperate regions (Poland vs. Croatia) affects the identification of particular environmental factors that subsequently influence the taxon-related indices of rotifers. A study on 10 water bodies found that taxon-trait indices were sensitive in identifying latitude differences, even though extreme weather conditions were not considered, and only two seasons (spring and autumn) were examined. A variable rotifer community, with a high share of rare species, was obtained. We found a distinctiveness of abiotic factors between both countries, indicating a higher trophic state in Poland. Although habitat conditions were more similar in spring compared to the autumn, the percentage of rotifer common taxa was alike in both seasons but variation in distinct species community was clear. Trophic state increase in Poland was reflected in the structure of dominant and distinct species, with a wide range of eutrophy indicators. Comparing how rotifer species respond to environmental conditions is important for developing methods to assess trophic state changes due to climate change. Single species, distinct or rare species, are often the first sign of changes.

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Microscopic food webs under vanishing winters

Stević

Pfeiffer

Balkić

et al. 2023

Ecohydrology & Hydrobiology

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Multi-annual comparisons of summer and under-ice phytoplankton communities of a mountain lake

Cited by 6 publications

References 78 publications

Beyond blooms: A novel time series analysis framework predicts seasonal keystone species and sheds light on Arctic pelagic ecosystem stability

Beyond blooms: A novel time series analysis framework predicts seasonal keystone species and sheds light on Arctic pelagic ecosystem stability

Spring and autumn rotifer community structure differentiates shallow water bodies in two European ecoregions: Poland and Croatia

Microscopic food webs under vanishing winters

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